PM2105

The PM2105 is a low cost, high-efficiency 2-stage GaAs MMIC power amplifier for commercial wireless applications. External frequency matching enables high performance to he obtained within a 30 to 100 MHz bandwidth anywhere in the 800 to 2000 MHz frcqucncy range  Performancc characteristics of the PM2105 make it well suited for saturated or linear operation.The PM2105 has accessible bias pins that allow for either class AB or class B operation and shutdown/power control functions.

Features of the PM2105 are:(1)>1 watt output power@5V; (2)55 % efficiency; (3)multiple biasing modes; (4)3 to 6 volt operation.The area beneath the amplifier and the associated matching networks must have a continuous ground plane or the resulting performance of the amplifier may be degraded. Terminate pins 1, 3, 8 and package base to a common ground pad. This ground pad must provide a connection to the back side of the ground plane with plated via holes. It is important to provide a good thermal path for the PM2105 since the dcvicc can dissipate up to 1.9 Watts of continuous average power.

The absolute maximum ratings of the PM2105 can be summarized as:(1)DC drain voltage:9.0 V;(2)storage temperature range:-65 to 150;(3)DC gate voltage:-5.0V;(4)average power dissipation:1.9W;(5)DC drain current:900mA;(6)junction temperature:150.The PM2105 requires external input, and interstage and output matching for proper operation. Lumped element networks can be used provided that trace lengths arc kept to a minimum.  Input match is accomplished using Ll and R2.The lossy matching network provides added stability while maintaining a broadband repeatable return loss. The interstage match consists of L2 and L3.Output match is accomplished by L,4, L5, C3 and C4. Paralleling capacitors is recommended to increase Q and self-resonant frequency. L4 must be able to withstand DC currents in excess of 900 mA for reliable operation. Extensive bypassing is rcconunended for linear digitally modulated applications requiring good IMD performance.